Yi CONTENTS. 



PART No. 71, NOVEMBER 1912. 

 Papers. 



PAGE 



A. E. CoNRADY, F.R.A.S. Resolution with Dark-ground Illumina- 

 tion (two figs, in text) 475 



John Btevens, F.R.M.S. Note on Proales {Notommata) gigantea 

 Glascott, a Rotifer Parasitic in the Egg of the Water-snail 

 (Plate 24) 481 



Duncan J. Reid, M.B., CM. Critical Illumination in Visual Work 



with the Microscope 487 



W. B. -Stokes. On Resolutions obtained with Dark-ground Illumi- 

 nation and their Relation to the Spectrum Theory . . . 497 



Julius Rheinbeeg, F.R.M.S. On Resolutions obtained with Dark- 

 ground Illumination and their Relation to the Abbe Theory .. .501 



Notes. 



R. T, Lewis, F.R.M.S. Note on Solpvga ferox 507 



E. M. Nelson, F.R.M.S. The Rousselet Compressor . , . . 511 



E. M. Nelson, F.R.M.S. An Improved Chromatic Condenser . . 513 



E. M. Nelson, F.R.M.S. An Aplanatic Spot-lens (fig. in text) . . 514 

 E. M. Nelson, F.R.M.S. On the " Pseudopodia " (Diatoms) (two 



figs, in text) 516 



N. A. Brown, A.L.S. Rliahdonema minutum 517 



Notices of Books 519 



The Club Cabinet 521 



Proceedings, etc. 



Proceedings from March 26th to June 25th, 1912, inclusive . . 527 

 Index to Volume XI 541 



